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TPS40042 Datasheet Preview

TPS40042 Datasheet

SYNCHRONOUS BUCK DC-TO-DC CONTROLLER

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TPS40042
www.ti.com
SLUS777 – NOVEMBER 2007
LOW PIN COUNT, LOW VIN (3.0 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC
CONTROLLER WITH EXTERNAL REFERENCE INPUT
FEATURES
1
2 3.0-V to 5.5-V Input
External Reference required: 0.5 V to 1.5 V
Output Voltage from REFIN to 90% of VIN
High-Side Drive for N-Channel FET
Supports Pre-Biased Outputs
Adaptive Anti-Cross Conduction Gate Drive
Fixed switching frequency (600 kHz) Voltage
Mode Control
Three Selectable Short Circuit Protection
Levels
Hiccup Restart from Faults
Active Low Enable
Thermal Shutdown Protection at 145°C
10-Pin, 3-mm x 3-mm SON (DRC)
APPLICATIONS
DDR Memory
Point of Load
Telecommunications
DC to DC Modules
CONTENTS
Device Ratings
2
Electrical Characteristics
4
Device Information
8
Application Information
10
Design Examples
18
Additional References
28
DESCRIPTION
The TPS40042 DC/DC controller is designed to
operate with an input source between a 3.0 V and 5.5
V. To reduce the number of external components, a
number of operating parameters are fixed internally.
The operating frequency for example, is internally set
at 600 kHz. (Continued)
VIN
Reference Input
Enable
TPS40042
1 REFIN
HDRV 10
2 EN
SW 9
3 FB
BOOT 8
4 COMP
LDRV 7
5 VDD
GND 6
VOUT
UDG-07141
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Predictive Gate Drive is a registered trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated




etcTI

TPS40042 Datasheet Preview

TPS40042 Datasheet

SYNCHRONOUS BUCK DC-TO-DC CONTROLLER

No Preview Available !

TPS40042
SLUS777 – NOVEMBER 2007
www.ti.com
DESCRIPTION (CONT.)
One of three short circuit threshold levels may be selected by the addition of an external resistor from the COMP
pin to circuit ground (no resistor is the default setting). During power on, and before the internal soft start
commands the output voltage to rise, the TPS40042 enters a calibration cycle, measures the current out of the
COMP pin, and selects an internal SCP threshold voltage. At the end of the 1.5-ms calibration time, the output
voltage is allowed to enter soft-start. During operation, the selected SCP threshold voltage is compared to the
upper MOSFET’s voltage drop during its ON time to determine whether there is an overload condition. If the
voltage across the MOSFET exceeds the threshold voltage, the TPS40042 counts seven continuous pulses
before shutting completely OFF for seven soft start charge/discharge cycles, after which, the TPS40042 attempts
to restart the output.
During startup, both the high-side MOSFET switch and the synchronous rectifier are held in the OFF state until
the internal soft start commands an output voltage higher than the voltage currently at the output. This may
happen when the output is pre-biased at some voltage greater than zero and less than the desired regulation
voltage. When the internal soft start first commands the output to rise, the pulse width of the synchronous
rectifier is slowly increased from zero to the full 1-D conduction time by a number of discrete steps. In this way,
inductor current is not allowed to reverse quickly, and ensures a monotonic startup of the output whether the
output starts from zero or from a pre-bias level. If power is applied to the device while the EN (enable low) pin is
allowed to float high, the TPS40042 remains OFF. Only when the EN pin is pulled down towards ground is the
controller allowed to start.
OPERATING FREQUENCY
600 kHz
600 kHz
ORDERING INFORMATION
PACKAGE
Plastic 10-pin SON (DRC)
Plastic 10-pin SON (DRC)
TAPE AND REEL QTY.
250
3000
PART NUMBER
TPS40042DRCT
TPS40042DRCR
DEVICE RATINGS
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range (unless otherwise noted, all voltages are with respect to GND.)
VDD
SW
SW
BOOT
HDRV
EN, FB, LDRV
,REFIN
COMP
PARAMETER
transient (< 50 ns)
Operating junction temperature
Storage junction temperature
VALUE
6.5
-3 to 10.5
-5
SW+6.5
SW to SW+6.5
-0.3 to 6.5
-0.3 to 3
-40 to 150
-55 to 150
UNIT
V
°C
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VVDD
VREFIN
TJ
PARAMETER
Input voltage to VDD pin
Voltage applied to REFIN pin during regulation
Junction temperature
MIN
TYP
MAX
UNIT
3.0
5.5
V
0.5
1.5
V
-40
125
°C
2
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS40042


Part Number TPS40042
Description SYNCHRONOUS BUCK DC-TO-DC CONTROLLER
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TPS40042 Datasheet PDF






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